One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,5,8)(3,6,4,7)(9,10)(11,13)(12,14)(15,16)(17,18)(19,28)(20,25)(21,26)(22,32)(23,27)(24,30)(29,31)(1,3,5,4)(2,6,8,7)(9,10)(11,15)(12,14)(13,16)(17,19,23,20)(18,24,27,29)(21,25,32,28)(22,31,26,30)(1,3,5,4)(2,7,8,6)(9,11,12,16)(10,13,14,15)(17,20,23,19)(18,25,27,28)(21,24,32,29)(22,31,26,30)(11,16)(13,15)(17,21,23,32)(18,26,27,22)(19,29,20,24)(25,30,28,31)(1,4,5,3)(2,7,8,6)(10,14)(13,15)(19,20)(24,29)(25,28)(30,31)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.